postcss-cli：使用本地与全局安装的 postcss 模块

Question

如何在本地安装 postcss 模块，并通过全局安装的 postcss-cli 使用它们？

例如：

postcss -u autoprefixer -o style.css index.css

如果我在全局安装了 postcss-cli 和 autoprefixer，或者两者都在本地安装，则此命令有效。但它不起作用，如果我在全球安装 postcss-cli，在本地安装 autoprefixer。

这个问题并不特定于 autoprefixer，因为 autoprefixer 将是一个模块，无论如何我都希望在全局安装什么。任何建议都会有所帮助。

这是我得到的错误，如果 postcss-cli 是全局安装的，而 autoprefixer 是本地安装的：

> postcss -u autoprefixer -o style.css index.css -w

module.js:327
    throw err;
    ^

Error: Cannot find module 'autoprefixer'
    at Function.Module._resolveFilename (module.js:325:15)
    at Function.Module._load (module.js:276:25)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at /home/user/.nvm/versions/node/v4.4.2/lib/node_modules/postcss-cli/index.js:104:14
    at Array.map (native)
    at Object.<anonymous> (/home/user/.nvm/versions/node/v4.4.2/lib/node_modules/postcss-cli/index.js:97:24)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)

npm ERR! Linux 3.19.0-58-generic
npm ERR! argv "/home/user/.nvm/versions/node/v4.4.2/bin/node" "/home/user/.nvm/versions/node/v4.4.2/bin/npm" "run" "css"
npm ERR! node v4.4.2
npm ERR! npm  v2.15.0
npm ERR! code ELIFECYCLE
npm ERR! Node.js@1.0.0 css: `postcss -u autoprefixer -o style.css index.css -w`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the Node.js@1.0.0 css script 'postcss -u autoprefixer -o style.css index.css -w'.
npm ERR! This is most likely a problem with the Node.js package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     postcss -u autoprefixer -o style.css index.css -w
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs Node.js
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! 
npm ERR!     npm owner ls Node.js
npm ERR! There is likely additional logging output above.

Answer 1

如果您使用的是 postcss-cli，您可以像这样创建一个配置文件：

{
    "use": [
      "postcss-import",
      "postcss-cssnext",
      "lost",
      "rucksack-css",
      "postcss-autoreset",
      "postcss-font-magician"
    ],
    "input": "src/app.css",
    "output": "css/main.css",
    "local-plugins": true,
    "autoprefixer": {
      "browsers": "last 2 versions"
    }
}

注意 "local-plugins": true, 行。来自文档：

Look up plugins starting from node_modules located in the current working directory. Without this option, postcss-cli will look for the plugins in the node_modules in which it is installed - specifically if it is installed globally it will only look for plugins that are globally installed.

如果您不想使用配置文件，您可以使用选项 --local-plugins。

总是在本地安装是个好主意。您始终可以在 package.json 中创建 NPM 脚本，以便运行 postcss-cli 更容易，如下所示：

"scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "node_modules/postcss-cli/bin/postcss -c config.json",
    "watch": "node_modules/postcss-cli/bin/postcss -c config.json -w",
    "minify": "node_modules/postcss-cli/bin/postcss -c config-minify.json"
 },

现在您只需使用：

npm run build

postcss-cli：使用本地与全局安装的 postcss 模块

postcss-cli: using locally vs globally installed postcss modules

npm

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